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- # SPDX-License-Identifier: GPL-2.0-only
- PHONY := __default
- __default: vmlinux.o modules.builtin.modinfo modules.builtin
- include include/config/auto.conf
- include $(srctree)/scripts/Kbuild.include
- # for objtool
- include $(srctree)/scripts/Makefile.lib
- # Generate a linker script to ensure correct ordering of initcalls for Clang LTO
- # ---------------------------------------------------------------------------
- quiet_cmd_gen_initcalls_lds = GEN $@
- cmd_gen_initcalls_lds = \
- $(PYTHON3) $(srctree)/scripts/jobserver-exec \
- $(PERL) $(real-prereqs) > $@
- .tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \
- vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
- $(call if_changed,gen_initcalls_lds)
- targets := .tmp_initcalls.lds
- ifdef CONFIG_LTO_CLANG
- initcalls-lds := .tmp_initcalls.lds
- endif
- # objtool for vmlinux.o
- # ---------------------------------------------------------------------------
- #
- # For LTO and IBT, objtool doesn't run on individual translation units.
- # Run everything on vmlinux instead.
- objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
- vmlinux-objtool-args-$(delay-objtool) += $(objtool-args-y)
- vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable
- vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr $(if $(CONFIG_CPU_UNRET_ENTRY), --unret)
- objtool-args = $(vmlinux-objtool-args-y) --link
- # Link of vmlinux.o used for section mismatch analysis
- # ---------------------------------------------------------------------------
- quiet_cmd_ld_vmlinux.o = LD $@
- cmd_ld_vmlinux.o = \
- $(LD) ${KBUILD_LDFLAGS} -r -o $@ \
- $(addprefix -T , $(initcalls-lds)) \
- --whole-archive vmlinux.a --no-whole-archive \
- --start-group $(KBUILD_VMLINUX_LIBS) --end-group \
- $(cmd_objtool)
- define rule_ld_vmlinux.o
- $(call cmd_and_savecmd,ld_vmlinux.o)
- $(call cmd,gen_objtooldep)
- endef
- vmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
- $(call if_changed_rule,ld_vmlinux.o)
- targets += vmlinux.o
- # module.builtin.modinfo
- # ---------------------------------------------------------------------------
- OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary
- targets += modules.builtin.modinfo
- modules.builtin.modinfo: vmlinux.o FORCE
- $(call if_changed,objcopy)
- # module.builtin
- # ---------------------------------------------------------------------------
- # The second line aids cases where multiple modules share the same object.
- quiet_cmd_modules_builtin = GEN $@
- cmd_modules_builtin = \
- tr '\0' '\n' < $< | \
- sed -n 's/^[[:alnum:]:_]*\.file=//p' | \
- tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$$/.ko/' > $@
- targets += modules.builtin
- modules.builtin: modules.builtin.modinfo FORCE
- $(call if_changed,modules_builtin)
- # Add FORCE to the prequisites of a target to force it to be always rebuilt.
- # ---------------------------------------------------------------------------
- PHONY += FORCE
- FORCE:
- # Read all saved command lines and dependencies for the $(targets) we
- # may be building above, using $(if_changed{,_dep}). As an
- # optimization, we don't need to read them if the target does not
- # exist, we will rebuild anyway in that case.
- existing-targets := $(wildcard $(sort $(targets)))
- -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
- .PHONY: $(PHONY)
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